Supertech Inconel Exhaust Valves Single-Groove MINI R53 | R52 | R50 | Cooper | Cooper S | JCW

New set Supertech Inconel exhaust valve.

These Inconel valves are made from Nimonic 751, an alloy known for its exceptional high-heat resistance, making them ideal for high-performance engines that experience extended periods of extreme temperatures.

These +2.3mm larger valves improve airflow by allowing more air and fuel into the combustion chamber, boosting power output. This reduces restrictions, improves the volumetric efficiency, and enabling the engine to breathe better, especially at high RPMs.

NOTE: We advise our customers that remapping the ECU is essential when installing these valves, as they generate increased airflow. Not remapping the ECU will result in severe engine damage.

ATTENTION:These valves require single-groove keepers and retainers!

Upgrading to Inconel exhaust valves is recommended for heavily tuned engines exceeding 280 HP to handle the increased temperatures.

Why upgrading to a single groove system?

Upgrading to a single groove valve keeper system is recommended for engines running extended periods at high RPMs, such as in circuit racing. This system offers better stability, reduced weight, and more precise valve spring control. It is less prone to wear, improving reliability and minimizing the risk of keeper slippage.

These valves require single groove keepers, click here for the correct keepers.

– Head size 25.50 (+2,3)mm

– Stem dia 5.92mm

– Length 118.37mm

– Angle 45 degree

– Keepers use KPR-6S/7

Sold in a complete set of 8 pcs.

Supertech valve springs are engineered to meet the extreme demands of high-performance and racing engines. Manufactured from premium alloys like chrome-silicon steel, they provide exceptional fatigue resistance and durability at high RPMs. Their optimized design ensures precise valve control, reducing the risk of valve float even in the most extreme conditions. Supertech’s valve springs are trusted by top engine builders for their strength, consistency, and race-proven reliability.